Photoluminescent multilayer film based on polyoxometalate and tris(2,2-bipyridine)ruthenium |
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Authors: | Huiyuan Ma Jun Peng Yanhui Chen Enbo Wang |
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Affiliation: | a Faculty of Chemistry, Northeast Normal University, Changchun, 130024, Chinab Faculty of Physics and Chemistry, Harbin Normal University, Harbin 150080, China |
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Abstract: | A photoluminescent multilayer film based on Keggin-type polyoxometalate PMo12O403− (PMo12) and transition metal complex tris(2,2-bipyridine) ruthenium [Ru(bpy)3]2+ (Ru(bpy)) was prepared by using layer-by-layer assembly(LBL). The formation of multilayer film was monitored by ultraviolet absorption spectra. The absorption intensity of characteristic peaks increase with a four-layer cycle, indicating that the LBL assembly film grow linearly and reproducibly from layer to layer. The composition of the film was measured by X-ray photoelectron spectrum (XPS). The data of XPS confirmed the presence of the expected elements. The film exhibited photoluminescence arising from π*−t2g ligand-to-metal transition of Ru(bpy) and redox activity attributing to molybdenum-centered redox processes of PMo12. The surface morphology of multilayer film was characterized by atomic force microscopy (AFM). The result shows that the film had a smooth surface with root-mean-square (rms) roughness ca. 1.363 nm for {PEI/(PSS/PEI/PMo12/Ru(bpy))3}. The grains are homogeneously dispersed in the substrate and have a rather narrow diameter size distribution. |
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Keywords: | Layer-by-layer self-assembly Polyoxometalate Luminescence Film Ruthenium |
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